TM 1-1520-238-23
2-304
Change 3
2.88.
ROTOR SUPPORT MAST SUPPORT BASE REMOVAL/INSTALLATION
2.88.1. Description
This task covers:
Removal. Cleaning. Inspection. Repair. Installation.
2.88.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
3/4 x 1/2-inch drive socket wrench adapter (item 5,
App H)
3/8 x 1/2-inch drive socket wrench adapter (item 6,
App H)
Light duty laboratory apron (item 27, App H)
44-inch x 3/4-inch drive telescopic bar (item 29, App H)
0.20 - 1.00-inch inside micrometer caliper (item 50,
App H)
3/4 x 6-inch long driftpin (item 113, App H)
5-inch x 1/2-inch drive socket wrench extension
(item 124, App H)
0.0015 - 0.0250-inch thickness gage (item 152, App H)
Chemical protective gloves (item 154, App H)
1/2-inch drive ratchet socket wrench handle (item 172,
App H)
5X & 12X monocular magnifier (item 206, App H)
Adjustable air filtering respirator (item 262, App H)
Rotor universal sling (item 292, App H)
15/16 & 1-inch box wrench (item 412, App H)
Socket wrench (item 428, App H) (p/o item 391 and
391A, App H)
or
Socket wrench (item 428A, App H) (p/o item 391A,
App H)
100 - 500 foot-pound 3/4-inch drive click type torque
wrench (item 438, App H)
0 - 600 inch-pound 3/8-inch drive dial indicator torque
wrench (item 447, App H)
Materials/Parts:
Cotter pin (4)
Cover (4) (figure D-243 and D-244, App D)
Adhesive (item 3A, App F)
Brush (item 34, App F)
Cloth (item 47, App F)
Corrosion preventive compound (item 62, App F)
Epoxy primer coating kit (item 76, App F)
Impression material (item 95, App F)
Paper (item 133, App F)
Petrolatum (item 138, App F)
Polyurethane coating (item 140, App F)
Sealing compound (item 179, App F)
Personnel Required:
67R
Attack Helicopter Repairer
Two persons to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1500-204-23
TM 55-1500-345-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
11.9
Longitudinal and collective bellcranks re-
moved
6.101
Main transmission removed
6.97
Main rotor support mast removed
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